Periodic Table of Elements

Atomic Number Symbol Atomic Mass

Alkali Metals Group One One valence electron Never found uncombined in nature Ex: Found in foods such as

Alkaline Earth Metals Group Two Two valence electrons Never found uncombined in nature Ex: Found in foods such as and in your

Let’s Review! Atomic ________ Atomic _______ This is the element’s _______. Group 1, the Alkali Metals, have _____ valence electron(s). Will you find the Alkali Metals or Alkaline Earth Metals uncombined in nature?

Transition Metals Groups 3-12 Can be found uncombined in nature Hard and shiny Good conductors

Boron Family Three valence electrons Have some characteristics of metals and some of nonmetals (metalloids) Ex:

Carbon Family Four valence electrons Carbon necessary for life on Earth (found in all living things) Ex: Tin (SN)

Nitrogen Family Five valence electrons Nitrogen makes up 80% of atmosphere Ex: Phosphorus, also found in your

Let’s Review! 1.What is one example of a transition metal? 2.Where can you find the Carbon Family? 3.What does the atomic number of an element tell you?

Oxygen Family Six valence electrons Oxygen necessary for most life forms Sulfur useful in manufacturing

Halogen Family Seven valence electrons Salt forming Dangerous uncombined, react easily Ex: A lethal gas, but found in a pool in the solid form. Helps kill germs in water. As a liquid, helps heal wounds.

Noble Gases Valence shells are full Rare in atmosphere Helium and Neon most common

Let’s Review! 1.How many valence electrons to noble gases have? 2. In which family would you find sulfur? 3.What is an example of an element in the halogen family?